Method for chemical conversion treatment of the surface of aluminum material and aluminum material

A technology of chemical conversion treatment and aluminum material, which is applied in the direction of metal material coating process, etc., can solve environmental problems, poor corrosion resistance and other problems
CN101356300AInactive Publication Date: 2009-01-28MITSUI MINING & SMELTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
MITSUI MINING & SMELTING CO LTD
Publication Date
2009-01-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

Disclosed is a method for chemical conversion treatment of the surface of an aluminum material comprising aluminum or an aluminum alloy. The method comprises performing a chemical conversion treatment of the surface of the aluminum material with a treatment solution for 1 to 5 minutes to form a coating film having excellent corrosion resistance and coating film adhesion property, wherein the treatment solution contains a trivalent chromium, and has a chromium nitrate content of 3 to 12 g / L in terms of Cr(NO3)3, a ammonium vanadate content of 0.5 to 7 g / L in terms of NH4VO3, a potassium fluorotitanate content of 0.5 to 3 g / L in terms of K2TiF6, a lithium fluoride content of 0.5 to 3 g / L in terms of LiF, a nitric acid content of 0.5 to 1.8 mL / L in terms of HNO3, and a liquid temperature of 40 to 50 C. Also disclosed is an aluminum material having a coating film formed by the method.
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Description

technical field

[0001] The present invention relates to a method for chemical conversion treatment (chemical conversion treatment) of the surface of an aluminum material containing aluminum or an aluminum alloy (hereinafter, aluminum and aluminum alloy are collectively referred to as an aluminum material) and an aluminum material having a film formed by the surface chemical conversion treatment. Specifically, it relates to a chemical conversion treatment method for the surface of an aluminum material that uses a treatment solution that does not contain hexavalent chromium but contains trivalent chromium, and an aluminum material having a film formed by the surface chemical conversion treatment. material. Background technique

[0002] As the chemical conversion treatment method on the surface of aluminum materials, hexavalent chromium such as alkali-chromate method, chromate method, phosphoric acid-chromate method, zinc phosphate method, non-chromate chemical conversion treat...

Claims

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